Projection-lamp.



K. KLEINERT. PROJECTIQN LAMP APPLICATION FILED MAY 22.4915:

Patented July 3, i917.

ATI'E] RN EYE UNITED STATES PATENT *oFFIoE.

' KA I. KLEINERT, F STUTTGART, GERMANY, ASSIGNOR TO THE FIRM or ROBERT BOSCH, o s'rUrTGn 'r, GERMANY.

PROJE TION-LA P.

Specification of Letters Patent.

Application filed May 22, 1915. Seria1No. 29,785.

To all whom it may concern:

Be it known that I, KARL K EINERT, a subject of the Emperor of Austria, residing at 57 Traubenstrasse,

have invented certain new and useful Improvements in Projection-Lamps; and I do directed. supplementary reflector disposed in fastened over the main reflectorof 'filament thereof; The glass cover 0 is fastened over the front ofthe'main reflector by a retaining;

tion, have and the incandescentlamp reflector with its light giving front of the source of light for reflecting back to the main reflector those rays which would otherwise be projected in undesirable directions divergent to the axis of projecheretofore been used, but the arms or brackets for supporting the supplementary reflector are disposed in'the field of projection ofthe light and they cause shadows or otherwise interfere with the effectiveness of the lamp. The object of the present in vention is to provide supportin means for the supplementary reflector who lly disposed out of the field of projection, and also to provide adjusting means therefor likewise wholly disposed out of the. 'field of projection and accessible from the outside of the lamp for adjusting the position of the supplementary reflector relatively to the source of light. In the preferred embodiment, I do this by means of an axially-disposed threaded rod fastened tothe rear of plementary reflector and passing through a nut held by the transparent cover whichis the rod'having an outwardly jection lamp,

' suitable for effecting axial disposed part movements, and a lock nut thereon for lock ing the rod and supplementary reflect-Orin adjusted axial position.

The accompanying drawing illustrates in central sectiolr this preferred embodiment in application tojanelectric headlight for moving vehicles," as anexample, in which an axially-directed"cylindrical beam is desired. The mainreflector a is of j b is supported from'the main positioned substantially at the focus rim carried onthe lamp housing. 13,;and is providediwith ainit T he supplementary Stuttgart, Germany,

the sup-- the pro-Y front ofthe source parabolic form,

reflector d is of spherical contour and partly encompasses the front of the incandescent lamp, its concave surface being mirrored toreflect back to the main reflector all of the rays which would otherwise be projected from the headlight in undesirable directions divergent to the axis of projection, as shown by the broken lines in the drawing. The threaded rod- 6 isattached to the rear of the supplementary reflector d and passes through the nut f. lt'has a slotted head j in front of the cover for adjusting the posi tion of the supplementary reflector relatively to the incandescent lamp I), the lock nuts 9 and it being provided adjusted position."

It will be observed that the supporting rod 6 is axially disposed and that it is wholly disposed out of-the' field of projection of the headlight. Furthermore, the adjusting means for the supporting 'rod 6 are likewise wholly disposed out of the field of projection and are accessible from the outside of the headlight. In this way, the supporting and adjusting means for the supp1ementary reflector do not cast shadows or otherwise interfere with the effectiveness of the headlight, and furthermore the supplementary reflector maybe adjusted in desiredposition without exposing the ished surface of the reflectors;

' Having thus described my invention, what "I claim is:

1. In a projection lamp,'a main reflector of parabolic form, tioned in front of the main reflector,a rear wardly-directed supplementary reflector in of light, a transparent which the light is proand supporthighly poll'amp cover through jected from the main reflector,

mg means disposed wholly out of the field of projection and connecting the su plethe mentary reflector to the cover, one 0 connections of the supporting means being effective to adjust the position of the supplementary reflector relatively to the source Of a 2. In a projection lamp, a main reflector of parabolic form, a source of light posi tioned in front of the main reflector, a rearwardly-directed supplementary reflector in front of the source of light, a transparent lamp .cover through which jected from the main reflector, and supporting means disposed along to lock the parts in a source of light posi the light is prothe axis of pro-- Patented'Jnly3,'1917.

jection wholly out supporting the supplementary reflector from the cover, said supporting means being adjected' from the main means disposed wholly-"outi'of thefield of justable axially tbadjust the position of the supplementary reflector relatiyelylto the projection and supporting the supplementary reflector from the cover, and. adjustingmeans also disposed wholly out of the field of projection and being accessible from the outside of the cover for adjusting the position of the supplementary reflector relatively to the source of light.

the field thereof and 4. In a projection lamp, of parabolic form, an incandescent lamp, a rearwardly-directed supplementary reflector in front of the lamp, a transparent lamp coyer through whichthe light is pro ected from the main reflector, and axially-adjustable supporting'means disposed along the axis of projection wholly out of the field thereof and being fastened to the supplementary reflector, said supporting means having an adjustable connection with the cover accessible from the outside thereof for supporting the I supplementary reflector therefrom in axially-adjusted position relatively to the lamp. y

In testimony whereof I affix my signature, in presence of two witnesses.

KARL KLEINERT. Vitnesses: 7

PAUL WVOLFART, ADOLI LEBHERT.

a main reflector 

